Featured Research

from universities, journals, and other organizations

Magellanic Cloud: Knots Of Evaporating Gas In Supernova Remnant Support Theory

Date:
February 8, 1999
Source:
University Of Illinois At Urbana-Champaign
Summary:
The expanding shock wave of a supernova remnant in the Large Magellanic Cloud has provided strong evidence to support a popular model of the interstellar medium, says a University of Illinois astronomer who directed an international team studying the object.

CHAMPAIGN, Ill. -- The expanding shock wave of a supernova remnant in the Large Magellanic Cloud has provided strong evidence to support a popular model of the interstellar medium, says a University of Illinois astronomer who directed an international team studying the object.

Related Articles


"One theory concerning the global structure of the interstellar medium says that supernova shock waves will interact with the cold gas and dust of the interstellar medium, eventually forming three distinct temperature phases," said You-Hua Chu, a U. of I. professor of astronomy. "Although this 'three-phase model' has been popular for the past 20 years, no one had found convincing evidence for one of the model's basic tenets -- a cold cloud evaporating in the hot medium."

To study the supernova remnant -- called N63A, Chu and her colleagues obtained optical images from the Hubble Space Telescope and high-resolution X-ray images from the ROSAT X-ray telescope. "The X-ray observations reveal the full extent of this huge supernova remnant," Chu said, "but the optical images show the features we are most interested in."

Among those features are three bright clouds of gas and dust, similar in size to the Orion Nebula. Two of the clouds show distinct filamentary structures indicative of shock-wave compression, Chu said. The outward rushing shock wave has not yet reached the third, most distant cloud.

Numerous shocked cloudlets -- smaller clumps of gas embedded in the interstellar medium -- also were detected within the supernova remnant. "Swept back by high-velocity shock waves, these evaporating cloudlets provide clear support for the three-phase model," said Chu, who presented the team's findings at the American Astronomical Society meeting, held Jan. 5-9 in Austin, Texas.

After a massive star is formed, its stellar wind blows much of the surrounding interstellar medium away, creating a huge shell in space called an interstellar bubble. "Because the interstellar medium is not homogeneous, the denser knots of material [cloudlets] are left behind," Chu said. "The optical emission region of this supernova remnant appears the way it does because the supernova exploded inside an interstellar bubble in a cloudy medium."

The supernova remnant lies in the Large Magellanic Cloud, a small neighboring galaxy to our own Milky Way, about 160,000 light-years from Earth.

In addition to Chu, collaborators on the project included astronomer John Dickel, visiting researcher Adeline Caulet, and graduate students Sean Points and Rosa Williams (all at the U. of I.); astronomer Margarita Rosado and graduate student Lorena Arias-Montano at the Universidad Nacionale Autonoma de Mexico; astronomer Annie Laval and graduate student Patricia Ambrocio-Cruz at the Marseille Observatory; and astronomer Dominik Bomans at the University of Bochum in Germany.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Magellanic Cloud: Knots Of Evaporating Gas In Supernova Remnant Support Theory." ScienceDaily. ScienceDaily, 8 February 1999. <www.sciencedaily.com/releases/1999/02/990208071924.htm>.
University Of Illinois At Urbana-Champaign. (1999, February 8). Magellanic Cloud: Knots Of Evaporating Gas In Supernova Remnant Support Theory. ScienceDaily. Retrieved February 28, 2015 from www.sciencedaily.com/releases/1999/02/990208071924.htm
University Of Illinois At Urbana-Champaign. "Magellanic Cloud: Knots Of Evaporating Gas In Supernova Remnant Support Theory." ScienceDaily. www.sciencedaily.com/releases/1999/02/990208071924.htm (accessed February 28, 2015).

Share This


More From ScienceDaily



More Space & Time News

Saturday, February 28, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Black Hole 12 Billion Times the Size of Sun Discovered at Dawn of Universe

Black Hole 12 Billion Times the Size of Sun Discovered at Dawn of Universe

Buzz60 (Feb. 26, 2015) Scientists are saying they&apos;ve spotted a black hole 12 billion time bigger than the sun. Patrick Jones (@Patrick_E_Jones) has the details. Video provided by Buzz60
Powered by NewsLook.com
NASA's Dawn Spacecraft Spots Two Bright Points On Ceres

NASA's Dawn Spacecraft Spots Two Bright Points On Ceres

Newsy (Feb. 26, 2015) NASA scientists still don&apos;t have a clear picture of the bright spots showing up on the surface of Ceres, a minor planet in the asteroid belt. Video provided by Newsy
Powered by NewsLook.com
Astronauts Rig Station for New U.S. Space Taxis

Astronauts Rig Station for New U.S. Space Taxis

Reuters - News Video Online (Feb. 25, 2015) U.S. astronauts float outside the International Space Station to rig parking spots for two commercial space taxis. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Water Leaks Into Astronaut's Helmet

Water Leaks Into Astronaut's Helmet

Reuters - US Online Video (Feb. 25, 2015) A dramatic finish to a spacewalk as NASA astronaut Terry Virts&apos; helmet pools with water. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins